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Maximum RAM that you can install in your laptop is 512 MB, so if you only have 128 installed in your laptop now YES you can still upgrade your laptop to 512MB.RAM Specs:
InstalledSize: 128.0 MB
Maximum RAM: 512 MB
Technology: SDRAM - 100.0 MHz
FormFactor: SODIMM 144-pin

Memory Upgrade for Toshiba Satellite Pro
4600 800 Laptop, the Toshiba Satellite Pro 4600 800 Laptop takes the
PC100 SDRAM SODIMMs. 256MB module must be 1" in height or less Memory
Type, and comes installed with 128 MB (removable) of
Memory. You can upgrade your Toshiba Satellite Pro 4600
800 Laptop to up to a maximum of
512 MB Memory, the system has 2 sockets to install
Memory, already with 128 MB (removable) standard Memory
installed. For best Laptop performance use the maximum amount of allowed
Memory per slot for your Laptop.

You can obtain your models service manual with instructions for how to replace and upgrade memory from this link. http://www.givemefile.net/smanuals/notebooks/toshiba/file/31033.html

Hope this helps FixYa! If you find this information helpful, please give us a rating and share your experience in a testimonial!

you buy the memory here for a great price or anywhere online instructions are on the page
it replaces the 512
http://cgi.ebay.com/1GB-DDR-333-for-Toshiba-Satellite-A75-S211-Memory-RAM_W0QQitemZ250353026446QQihZ015QQcategoryZ158897QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

The
Toshiba Satellite A75-S211 Memory RAM has a memory card slot or slots,
that allows you to add more memory to your Toshiba Satellite A75-S211
Memory RAM, giving you enhanced performance and speed. You will see the
Immediate speed increase in your computers performance. Stop waiting for programs, and functions to happen, STOP WAITING!!! Start enjoying technology as you should.
We work directly with our memory card manufacturer to insure perfect
compatibility with the Toshiba Satellite A75-S211 Memory RAM. Only
using the highest quality memory chipsets for our memory cards, so you
are assured compatibility and performance. All of our memory cards are
Designed and Optimized for Toshiba Satellite A75-S211 Memory RAM .
Technical specialists have personally verified our memory cards
compatibility with the Toshiba Satellite A75-S211 Memory RAM. Worry Free Installation: Just Follow these Steps Desktop and Laptop instructions below.Desktops

Unplug Power cable

Remove Case

Slide memory card in Open slots- the memory card will only fit in one way

Snap the side clips in place

Close Case and Power Up

You are ready to go.

Laptop

unplug and remove Battery from laptop

Open memory compartment on bottom using Philips screw driver

inset memory in open slot, if no open slot remove current memory by pinching metal clasp on side of memory

the laptop should pick up a 20gb or 60gb ide hard drive with no problem

Memory Upgrade for Toshiba Satellite 2775XDVD Laptop, the Toshiba Satellite 2775XDVD Laptop takes the PC100 SDRAM SODIMMs Memory Type, and comes installed with 64 MB (non-removable) of Memory. You can upgrade your Toshiba Satellite 2775XDVD Laptop to up to a maximum of 192 MB Memory, the system has 1 socket to install Memory, already with 64 MB (non-removable) standard Memory installed. For best Laptop performance use the maximum amount of allowed Memory per slot for your Laptop. Choose the following Memory Upgrade for Toshiba Satellite 2775XDVD Laptop